EP 1591771 B1 20080528 - Non-destructive method of determining the refractive index of clear coats
Title (en)
Non-destructive method of determining the refractive index of clear coats
Title (de)
Verfahren zur zerstörungsfreien Bestimmung des Brechungsindexes eines Klarlacks
Title (fr)
Procédé d'examen non destructif pour déterminer l'indice de réfraction d'une couche transparente
Publication
Application
Priority
US 83285604 A 20040427
Abstract (en)
[origin: EP1591771A1] The invention is directed to a method for non-destructive determination of the refractive index of un-pigmented or transparently pigmented coatings or of binder systems comprising the following steps:A) application of a transparent layer of an un-pigmented or transparently pigmented coating or an un-pigmented binder system onto a darkly pigmented substrate;B) optional drying and/or curing of the coating obtained;C) acquisition of the reflection spectrum of the coating obtained with a spectrophotometer with d/8° measurement geometry with the specular component included and with the specular component excluded;D) determination of the differential spectrum between the reflection spectrum with the specular component included and reflection spectrum with the specular component excluded; andE) determination of the refractive index of the coating or binder system with the assistance of the differential spectrum obtained in D) by making use of a previously determined relationship between the difference in the reflection spectrum with the specular component included and the reflection spectrum with the specular component excluded of the coating or binder system and the refractive index of the corresponding coating or binder system.
IPC 8 full level
G01N 21/47 (2006.01); G01N 21/57 (2006.01)
CPC (source: EP US)
G01N 21/474 (2013.01 - EP US); G01N 21/8422 (2013.01 - EP US); G01N 2201/065 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1591771 A1 20051102; EP 1591771 B1 20080528; AT E397207 T1 20080615; DE 602005007101 D1 20080710; US 2005237515 A1 20051027; US 7248350 B2 20070724
DOCDB simple family (application)
EP 05008719 A 20050421; AT 05008719 T 20050421; DE 602005007101 T 20050421; US 83285604 A 20040427